singleton

Short definition from Wiktionary

Noun

1. 1
   A playing card that is the only one of its suit in a hand, especially at bridge.
2. 2
   A hand containing only one card of a certain suit.
3. 3
   A single object, especially one of a group.
4. 4
   A class that may not be instantiated more than once, i.e. that implements the singleton design pattern.
5. 5
   A set with exactly one element.
6. 6
   A child or animal that is born singly, not as a twin or other multiple birth.
7. 7
   A person without a romantic partner.
8. 8
   A person without a dissociative identity.
9. 9
   A single consonant, as opposed to a geminated consonant.
10. 10
    Synonym of blot.
11. 11
    A class offered only once within a school year.

Adjective

1. 1
   Of a class offered only once within a school year.

Proper noun

1. 1
   A placename: A village and civil parish in Fylde borough, Lancashire, England (OS grid ref SD3838).
2. 2
   A placename: A suburb in Great Chart with Singleton parish, Ashford borough, Kent, England (OS grid ref TQ9841).
3. 3
   A placename: A village and civil parish in Chichester district, West Sussex, England (OS grid ref SU8713).
4. 4
   A placename: A town and local government area (Singleton Council) north-west of Newcastle, New South Wales, Australia.
5. 5
   A placename: An outer southern suburb of Perth, Western Australia.
6. 6
   A habitational surname from Old English.